The cast iron is obtained by re-melting pig iron with coke and limestone in a furnace known as a cupola. It is an alloy of iron and carbon. The carbon contents in cast iron differ from 1.7% to 4.5%. Also, it contains a very small amount of silicon, sulfur, manganese, and phosphorus.
Carbon is present in the following two forms:
Following are the important properties of cast iron that make it a valuable material for engineering purposes.
The cast iron compressive strength is greater than tensile strength.
Following are the values of the ultimate strengths of cast iron.
Types of Cast Iron
The following are types of cast iron used for engineering purposes:
Grey cast iron is commercial iron has the following compositions:
It consists of Carbon – 3 to 3.5%, Silicon – 1 to 2.75%, Manganese – 0.40 to 1%, Phosphorus – 0.15 to 1%, Sulphur – 0.02 to 0.15% and the remaining is iron.
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